$\mathrm{C}_6 \mathrm{H}_6$ freezes at $5.5^{\circ} \mathrm{C}$. The temperature at which a solution 10 g of $\mathrm{C}_4 \mathrm{H}_{10}$ in 200 g of $\mathrm{C}_6 \mathrm{H}_6$ freeze is
$\_\_\_\_$ ${ }^{\circ} \mathrm{C}$.
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